My questions is as it will be an 8x8 grid of RGB LEDs giving 192 individual LEDs at 25ma each will I need a 4.8A+ powersupply or does multiplexing mean I only need a 600ma supply as only one row will be lit up at a time.
If you multiplex 192 LED's with two 16-channel drivers, this suggests a 1/6 duty cycle (192 / 32). With a 600mA power supply, perceived light intensity will then equal the equivalent of 3.12mA per LED. To get the full potential from your LED's, you need to feed each LED 6 times the rated current or about 120mA each (this is also max drive current for the tlc5940). For this, you need a DC power adapter with a minimum output of 3.84A (120mA * 32).
Fortunately, there are also some complex psychological effects that end up meaning that "perceived brightness" for a pulsed LED may have more to do with peak brightness rather than average brightness, at least under some circumstances...
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